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DATE: MAY 13, 1991 <br />TO: JAMES E. CHANDLER <br />COUNTY ADMINISTRATO <br />FROM: TERRANCE G. PINT <br />DIRECTOR OF UTIL Y SERVICES <br />PREPARED WILLI MCCAIN <br />AND STAFFED CAPI ECTS ENGINEER <br />BY: DEP PNT OF UTILITY SERVICES <br />.SUBJECT: CHANGE ORDER NO. 1, NORTH BEACH WELLS <br />IRC PROJECT NO. UW -89 -01 -DC <br />;BACKGROUND <br />!In late March 1991, we completed testing and logging of the new Well <br />No. 3 at the North Beach facility. The original contract was set' <br />up to drill two new wells at the North Beach facility with the <br />option of rehabilitating Well No. 2. Well No.. 2 has consistently <br />had chloride levels far beyond the acceptable limit even for the, <br />Reverse Osmosis process utilized at this facility. As a result of <br />the well logs, it was determined that the bottom 80 feet of the well <br />was to•be plugged; this was done to reduce the chloride levels. <br />This action however substantially reduced the flow. 'We now wish to <br />have the well redrilled to its previous depth to increase the <br />production. The associated chloride level will rise but should not <br />increase to an unacceptable level. <br />ANALYSIS <br />By redrilling Well No. 3, we should not have to drill a replacement <br />well, thereby saving approximately $70,000.00 on the contract. <br />Through information acquired from Well No. 3, it has been determined <br />that the existing bad well at the facility (Well No. 2) can also be <br />back -plugged to reduce the chloride levels. The total cost <br />associated with this change order is $9,843.00. (see attached change <br />order). <br />RECOMMENDATION <br />The staff of the Department of Utility Services recommends that the <br />Board of County Commissioners approve the attached change order with <br />Diversified Drilling Corporation in the amount of $9,843.00. <br />Commissioner Eggert asked why we would not be back in the same <br />position with the chloride. <br />Utilities Services Director Pinto explained when we <br />established the new well, we went down to the maximum depth but <br />found that the water quality was not quite what we wanted. We came <br />up, did a plugging and then found after pumping that we cannot get <br />the quantity we need. So what we are doing is sacrificing some <br />quality for quantity. We are almost convinced that the only <br />rehabilitation to the well that we will be able to do is <br />11-V <br />